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(No Model.) 2 She'ets--Sheet 1'.

PIETRO DALL ORTO.

ROTARTENGINE.

Patentedl Dec. 5,1882.

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PIETRO DALL 0RTO, `ROTARY ENGINE.

No. 268,719. Patented Deo. 5. 1882.

UNITED STATES PATENT @einen PIETRO DALL ORTO, 0F GENOA, ITALY.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 268,719, dated December 5, 1882..

Application filed June 9, 1882. (No model.) Patented in `Italy October 14, 1881, No. 197 in France December S, 1881. N o. 134,246 in Belgium December 16, 1881, No. 40,863 in England December 23, 1881, No. 5,641; in Austria December 24.1881, and in Germany January 3, lesa, No. 13,305.

To all whom it may concern Be it known that I, PIETRO DALL ORTO, a subject'of the Kingdom of Italy,residing at Genoa, Italy, have invented certain new and` useful Improvements in Rotary" Engines, of which the following isspecitication.

Thepresent invention relates to that class of engines in which a rotary disk provided on its periphery with a piston or projection operales in a steam-chamber containing a movable abutment, the position of the latter in relation to the. piston being controlled by a cam, link,4

and crank mechanism receiving motion from the axis of the piston-disk.

The invention consists in the combination of two rotary disks littcd on the same shaft, and each provided with a peripheral piston or projection located diagonallypopposite to each other. These projections operate in independent steamchambers having curved ports for the ingress of steam, and the disks or projections are provided with passages for admitting steam into a chamber or space formed by said pistons, and oscillating abutments located at the top ofthe steam or working chambers. The admission ot the steam into these chambers takes place so long as the piston-ports are opposite the curved openings in the workingchambers, and the various'portsare so located that the steam acts first upon one piston with its full initial force to eeect a quarterrevolution of the shaft, then expansively upon the same piston to causeV the shaftto make another quarter-revolution, and nally by the action ot the steam upon the other piston in a manner the same as with the first piston the shaft is caused to make a complete revolution.

The invention also consists in an oscillating abutment and cam, link, and crank mechanism t'or'operating the same from the shaft of the rotary pistons, as will hereinafter be more fully set forth.

In the accompanying drawings, Figure] represents a cross-section of the engine. Fig. 2

represents a longitudinal section through the axis ofthe cylinder. Fig. 3 represents an end view ot' the engine. Figs. 4 and 5 are crossseciions representing the interior of the two ends of the cylinder and the cylindrical cap or lining. Fig. 6 represents the interior and Fig. 7 the exterior of the end cover with the orifices for the admission of the motive tluid, and Fig. 8 represents the double cam for operating the rotary stop or abutment.

A is the cylinder, which is divided into tvv working-chambers bymeaus of a central partition; or two independent cylinders may be secured together, as is shown in Fig.. 2. These chambers contain two pistons or, rather, disks xed upon theshat'tE. These disksB are each provided with a tooth or projection, M. These projections are placed opposite to each other, as shown at Fig. l, in which one ot' the said projections is shown by dotted lines and the other by full lines. luFigrZ the two .projections are shown in position diagonallyopposite to each other. The cylindrical cap or lining L is placed beneath the projection M ofthe piston in such manner thatan annular space is left in which the projection M turns, such annular space being formed between the sides or ends A and the cylindrical parts of the cylinder A and the surface of the cap or lining L. In Fig. l the piston B is shown in the position it would assume at the moment when it receives the impulse from the steam which enters by the orifice J in the end cover shown at Fig. 4 and by the orifice H in the piston B. The steam exerts its pressure upon the projection M by pressing against the abutment C, and in this way this projection accomplishes a quarter of its course, being pushed by the direct pressure of the steam. Then the open-` ing H in the piston corresponding'no longer with the opening J in the cover by which the steam enters, the latter is cutoff, and then acts only by expansion for the remainder of its course. The projections M of the pistons being in position diagonally opposite to each other and the steam acting upon them equally but not at the same time, it results therefore that there is a quarter-revolution given to each with the full pressure ofsteam-that is to say, the shaft will make a semi-revolution with full steam. The steam may escape by the tube F into the air or into a condenser. The abutments C, turning to the right or to the left, permit the'passagc of the projections M, after which they serve as abutments for the steam. The reeiprocatingcircular'motion of the abutments O is obtained by means ot' the double cams D, secured to the shaft E and imparting motion to the connecting-rods P, which carry bottom rollers, R, traveling on the cams, and are connected with cranks S on the abutments. The rods Pare slotted for the passage of the shaft E. The cams are shown at Figs. 2 and 3in the position they would occupy when one of the pistons is working by the full pressure ot' the steam and thenther by expansion of the steam, the latter escaping bythe tube F.

ln Fig. 2, m m represent the stuiing-boxes 15 for the shafts ot' the abutments O.

lf it is desired to reverse theI motion of the engine, then by valves (not shown in the drawings) the passages J are closed, and those marked K are opened, by which means the 2o steamvis caused to enter the cylinder through in the contrary direction.

The cylinder A is xed by bolts upon the Sim nllbase Z, upon which are also fixed the standards Iinvention, and the mode in which the same is carried into effect, I would have it understood that what I claim is 1. In a rotary engine, the combination ot the cylinder A, having two independent Working-chambers, provided with curved or elongated inlet-ports Jvand I( and outlet-passages F, and shaft E and disks B. having projections or pistons M, located diagonally opposite toeach other,and provided with inlet-passages H H. with movable abutments O, and means, substantially as shown, for operating the same, as and for the purpose set forth.

2. The combination of the curved oscillating abutments C, cranks S, slotted links P, and rollers R with the shaft E, double cams D, disks B, and pistons M, as and for the purpose set forth.

In testimony that I claim the foregoing as my invention I have signed my name, in presence ot' two Witnesses, this 6th day ot' December, 1881.

PIETRO DALL7 ORTO.

Witnesses i H. ENGEL, GIACOMO GIAOOMELLI. 

